Portion of a shoe sole



FIG. 1 is a rear perspective view of a portion of a shoe sole showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a front perspective view thereof; and,

FIG. 4 is a rear elevational view thereof.

The broken line showing of a shoe upper and the remaining portion of the sole in FIGS. 1-4 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a shoe sole, as shown and described. 